Industrial Pretreatment Program

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Industrial Pretreatment

Permission To Discharge to Sanitary Sewer

Since every waste stream is unique, businesses should contact Environmental Services and speak to the IP Program coordinator to obtain permission to discharge to the sanitary sewer.  

Be prepared to provide all of the following information:

  • types and amounts of pollutants the wastes contain- MSDS and sample analyses may be required;
  • industrial wastewater classification survey;
  • total volume of the wastes;
  • how the wastes will be discharged; and
  • frequency of the discharge (one time, intermittent or continuous).

Discharges must not violate any of the general prohibitions of the Municipal Code 14.08.310. Contact the IP Program if the wastes exceeds any local limit listed in Code 14.08.312.

Discharge must not cause pass through or interference of the POTW.


All costs associated with sampling a waste are the responsibility of the discharger.

Surcharges Applicable

The treatment plant may accept high strength wastes. High strength is considered wastes with pollutant loadings greater than domestic values (BOD>340 mg/L, TSS>250 mg/L or TKN>50 mg/L). Surcharges are applicable. Slug loads are prohibited.

Do I Need a Discharge Permit?

Contact Environmental Services and work with the IPP coordinator. You are required to obtain a permit if your business meets the EPA's definition of Significant Industrial User (40 CFR 403.3 (v)) even if you do not discharge.

What will be my Discharge Limits in a Permit?  This will be determined with the IPP coordinator.

  • For nonconventional parameters (metals, cyanide), limitations are based on the most stringent value for the specific categorical pretreatment standards for your industry and local limits listed in Municipal Code 14.08.312.
  • For conventional parameters (BOD, TSS, TKN), limits are based on your discharge volume and the WWTP loadings available for all SIUs. Please note that limitations on conventional pollutants is used to avoid slug loading upon the WWTP. Pollutant loads exceeding residential wastewater values are subject to surcharge fees.

Hazardous Waste

Learn more about hazardous wastes reporting requirements.

Need FREE assistance in understanding hazardous wastes and other environmental regulations?

Boulder County Hazardous Materials Facility will accept hazardous wastes for a fee from businesses that have CESQG status.

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